The process of the isolation of a metal by dissolving the ora in a suitable chemical regent followed by precipitaiton of the matal by a more electropositive metal is called:

Options

A. hydrometallurgy
B. electrometallurgy
C. zone refining
D. electrorefining

Answer

To solve the question regarding the process of isolation of a metal by dissolving the ore in a suitable chemical reagent followed by precipitation of the metal by a more electropositive metal, we can break it down into the following steps:

### Step-by-Step Solution:

1. **Understanding the Process**: The question describes a method of extracting a metal from its ore. This involves two main steps: dissolving the ore in a chemical reagent and then precipitating the metal using a more electropositive metal.

2. **Identifying the Process**: The process being described is known as **hydrometallurgy**. This is a technique used to extract metals from their ores using aqueous solutions.

3. **Example of Hydrometallurgy**: To illustrate hydrometallurgy, we can use the example of silver extraction. When silver ore is treated with a dilute solution of sodium cyanide (NaCN), the silver dissolves to form a soluble complex.

- **Reaction**:
\[ 4 \text{Ag} + 8 \text{NaCN} + \text{O}_2 + 2 \text{H}_2\text{O} \rightarrow 4 \text{NaAg(CN)}_2 + 4 \text{NaOH} \]

4. **Precipitation of Silver**: The soluble complex formed can then be treated with a more electropositive metal, such as zinc (Zn), to precipitate the silver.

- **Reaction**:
\[ 2 \text{NaAg(CN)}_2 + \text{Zn} \rightarrow 2 \text{NaCN} + \text{Zn(CN)}_2 + 2 \text{Ag} \]

5. **Conclusion**: The process described in the question is indeed hydrometallurgy, where the metal is isolated through dissolution and subsequent precipitation.

### Final Answer:
The process of isolation of a metal by dissolving the ore in a suitable chemical reagent followed by precipitation of the metal by a more electropositive metal is called **hydrometallurgy**.

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